B2B SaaS MVP in 12 Weeks in Dublin 2026: Build Cost and Scope

The verdict in three sentences

A useful B2B SaaS MVP does not try to do everything: it validates one core feature with real paying customers. In 2026, budget 10 to 14 weeks and EUR 45,000-90,000 with a team of 1 PO, 2 devs and 1 UX on a Next.js + Supabase + Stripe stack. Every euro spent beyond that one feature pushes back your validation and burns runway before the raise.

What the MVP includes — and excludes

The number-one trap in Dublin as everywhere: confusing an MVP with a finished product. The MVP proves a value hypothesis, not a full roadmap. The "out of scope" column below is not abandoned — it is simply deferred to phase 2, after the first customer feedback.

A well-scoped MVP fits on one page of specs and 8 to 12 user stories. If your backlog exceeds 30 stories, you are no longer building an MVP.

Budget breakdown by work package

The figures below are a 2026 order of magnitude for an agency build in Europe, average day rate EUR 550. The low end assumes disciplined scope; the high end adds third-party integrations (CRM, ERP) and richer design.

Add a 10-15% contingency and you land within the stated EUR 45,000-90,000 range. After launch, maintenance (bug fixes, small evolutions) runs EUR 800-1,800/month.

The 12-week plan

Mini case study

Aoife, founder of a software SME in Dublin, wants to validate a compliance-tracking tool for accounting firms before a seed raise. MVP scope: importing client files + deadline alerts (the core feature), nothing else. Negotiated budget: EUR 62,000, delivered in 12 weeks. She signs 4 pilot firms at EUR 149/month each, i.e. EUR 596 MRR by month 3. With these metrics (80% activation rate, zero churn), she approaches her raise with proven, quantified traction rather than a slide deck. The build paid for itself in investor narrative long before it did in cash.

FAQ

Why not add two or three more features "while we're at it"?

Each extra feature adds EUR 15,000-25,000 and 2-4 weeks, and dilutes the validation signal. A one-feature MVP tells you clearly whether the market wants your solution; a five-feature MVP leaves you guessing which one convinced them.

What public support can cut the bill in 2026?

Irish and EU schemes (Enterprise Ireland, Local Enterprise Office grants, EU digital innovation funds) can cover 20-50% depending on your profile and region. Amounts are case-by-case and never guaranteed, so validate eligibility early.

Why Next.js and Supabase rather than a fully custom stack?

This pair provides auth, a Postgres database, storage and real-time out of the box, saving 15-25 days of plumbing. You spend the budget on your differentiating feature, not on infrastructure.

Do I own the code and can it be handed over easily?

Yes: you own 100% of the Git repository and the infrastructure. A standard, documented stack eases technical due diligence during the raise and handover to an internal team.

How long until paying customers?

With assisted onboarding from week 12, first payments typically land in month 2 or 3 post-launch. The goal is not volume but proof: 3 to 5 paying customers are enough to validate the value hypothesis.

Let's scope your project. Tell us your core feature, indicative budget (EUR 45,000-90,000) and raise timeline: we will scope an MVP shippable in 12 weeks. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.